Absorbent yarn bobbin

ABSTRACT

A textile yarn support comprising an absorbent paper core and perforated plastic film on its outer surface. The perforations allow excess yarn finish to pass to the underlying absorbent paper core. In some instances, an imperforate plastic film is embedded between layers of the core to prevent finish absorption from proceeding completely through the support.

United States Patent [1 1 Wray Dec. 24, 1974 ABSORBENT YARN BOBBIN 3,682,816 8/1972 Yovanovich 242/61 [75] Inventor: Rhodes Ebeling Wray, Staunton,

Primary ExaminerGeorge F. Mautz [73] Assignee: E. I. du Pont de Nemours and Company, Wilmington, Del.

[22] Filed: Oct. 18, 1971 [57] ABSTRACT [21] Appl. No.: 190,108

l A textile yarn support comprising an absorbent paper core and perforated plastic film on its outer surface. U-S. Cl- 18.32, The perforations allow excess yarn finish to pass to the underlying absorbent paper core In some instances Field Of Search 1, an impe -fo ate plastic is embedded between lay- 242/113-31, 1137, 68/198 ers of the core to prevent finish absorption from proceeding completely through the support. [56] References Cited UNITED STATES PATENTS 6 Claims, 4 Drawing Figures 2,162,841 6/1939 Dunlap 242/1l8.1

FIG-I F|G.3 e I6 INVENTOR RHODES EBELING WRAY ATTORNEY ABSORBENT YARN BOBBIN BACKGROUND OF THE INVENTION This invention relates to textile yarn supports, such as bobbins, cones, tubes and cops, customarily employed for winding thread, yarns, fibers, filaments and the like. The term support as used herein is intended to include all such shapes that may be used for textile winding. In particular, the invention relates to a textile support that will absorb excess yarn finish oils from the inner layers of a yarn package.

The various types of materials which may be handled on yarn supports such as threads, filaments, fibers, yarns, etc., and of various substances, such as cotton, silk, wool, rayon, polyamide, polyester, polyacrylic and spandex are herein referred to as yarn. The invention is particularly useful with respect to spandex yarn.

Excessive amounts of yarn finish oils present several problems in handling yarn products. These problems include staining of the product, slippage of yarn to be processed in equipment and dripping of finish through machinery or on the floors. It has been observed that the inner layers of spandex packages, particularly in the case of low denier yarns, have an unduly high concentration of finish oils. This is particularly noticeable in the case of spandex yarns requiring a high finish level, suchas above 3.5 percent by weight, as used in forming warp beams of spandex. Ordinarily, a creel of packages of spandex yarn suffices to prepare several warp beams. Excessive finish in the inner layers of the spandex packages tends to cause uneven metering of the affected spandex, which requires the warping to be carried out at lower speeds. Moreover, excessive finish that tends to drip from yarn packages known heretofore requires that such packages be specially wrapped, as in plastic bags.

SUMMARY OF THE INVENTION This invention provides a textile yarn support comprising a core of absorbent material having an outer surface to which a perforated plastic film is adhered. The plastic provides a high-friction surface affording efficient transfer during winding while the perforations allow excess yarn finish to pass to the underlying absorbent material of the bobbin.

Preferably, an imperforate plastic film is embedded between layers of absorbent material forming the core to prevent finish absorption from proceeding completely through to the lower layers of the core, which might impair the strength of the support under load. The perforations in the surface film may extend as indentations into the outer surface of the core but must not penetrate the inner film.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS FIG. I is a perspective view of a textile yarn support embodying the present invention.

FIG. 2 is a perspective view of another embodiment of this invention.

FIGS. 3 and 4 are enlarged schematic sections taken through the textile yarn supports of FIGS. 1 and 2, re-

vspectively.

In FIGS. 1 and 3, a textile yarn support is comprised of an absorbent paper tube 12 that forms the core of the support and a plastic film l4 adhering to its outer surface. Perforations 16 extend throughout the area of film 14. In FIGS. 2 and 4, support 10' has an imperforate plastic film 20 sandwiched between layers 22, 24 of the core 12'. In the illustrated embodiment, film 20 is located about one-third of the distance from its inner surface 18 to its outer surface 19.

Although the textile yarn support of this invention may be in a variety of shapes, the tube type (cylindrical) as exemplified in FIGS. 1 and 2 is preferred. The' paper tube forming cores 12, 12 may be formed by winding a paper blank upon itself convolutely to provide a laminated paper structure held together by adhesive applied to the paper blank before winding. Cores 12, 12' may be made up from any suitable paper stock, although kraft stock is usually used. Also, instead of a wound, laminated paper body as described above, a molded paper body may be used if desired. The preferred dimensions of the tubular support 10 are as follows:

Length from about 2 to 5 inches (50.8 to 127 mm.)

Outside diameter from about 3 to 5 inches, (76.2 to 127 mm.)

Wall thickness from about A to inch, (6.35 to 9.53 mm.)

The plastic film 14 used on the outer surface of the paper tube may be of any flexible, durable film-forming material that possesses the desired frictional surface characteristics for yarn adherence during winding. Suitable materials are cellulose acetate and Saran" vinylidene copolymers. The latter is preferred. The plastic film 20 embeddedbetween layers 22, 24 of the core 12' in the preferred embodiment of this invention may be of a composition the same as or different from film 14.

The plastic film 14 may be applied to cores 12, 12 by any of the processes known to the art. For example, a plastic tube may be formed in an extrusion operation, cut to suitable lengths and applied to the paper core by the methods described in British Pat. No. 716,036 or British Pat. No. 993,228. The embedded, imperforate, plastic film 20 is incorporated during the formation of core 12' by well-known methods.

The perforations 16 in the plastic film 14 may be of any suitable shape, such as circular, rectangular, or rhomboid. The perforations may be placed at random in the film, or they may be in a regular pattern chosen as most suitable for the yarn to be wound on the support 10. Slits in the film are satisfactory. The film may be perforated in conventional manner, such as by knife, punch, or toothed wheel, either before or after placement on the tube. If the film is perforated when in place on the tube, the perforating tool may be advantageously adjusted to penetrate slightly into the paper body of the cores 12, or 12 to form indentations such as 17 shown in FIG. 4. These have the same cross sectional area as the perforations 16 and expose a greater surface area of the absorbent material to enhance absorption of excess yarn finish. However, care should be taken not to penetrate so deeply as to weaken the core nor as to perforate the embedded film 20, if such is present.

The textile yarn supports of this invention are particularly advantageous for use with spandex filaments containing a high concentration of silicone-based finish.

What is claimed is:

1. A textile yarn support comprisingi an imperforate core of absorbent material having an outer surface; and a plastic material having perforations therethrough adhered to said outer surface, said plastic material constituting a winding surface for the .yarn.

2. The yarn support as defined in claim 1, said core being laminated and comprising layers of absorbent material; and an imperforate layer of plastic film between adjacent layers of the absorbent material forming the core.

3. The yarn support as defined in claim 1, saidvcore having indentations in said outer surface, said indentations being in alignment with said perforations.

4. A textile yarn support comprising layers of absorbent material forming a tubular absorbent paper core defined by inner and outer surfaces having an imperforate layer of plastic film between adjacent layers of the core, said film being located about one third the distance between said inner and outer surfaces; and a perforated plastic material adhered to said outer surface, said perforated material constituting a winding surface for the yarn.

5. The yarn support as defined in claim 4, said core having indentations in said outer surface, said indentations being in alignment with the perforations in said plastic material.

6. The yarn support as defined in claim 5, said indentations and said perforations having the same cross sectional area. 

1. A textile yarn support comprising: an imperforate core of absorbent material having an outer surface; and a plastic material having perforations therethrough adhered to said outer surface, said plastic material constituting a winding surface for the yarn.
 2. The yarn support as defined in claim 1, said core being laminated and comprising layers of absorbent material; and an imperforate layer of plastic film between adjacent layers of the absorbent material forming the core.
 3. The yarn support as defined in claim 1, said core having indentations in said outer surface, said indentations being in alignment with said perforations.
 4. A textile yarn support comprising layers of Absorbent material forming a tubular absorbent paper core defined by inner and outer surfaces having an imperforate layer of plastic film between adjacent layers of the core, said film being located about one third the distance between said inner and outer surfaces; and a perforated plastic material adhered to said outer surface, said perforated material constituting a winding surface for the yarn.
 5. The yarn support as defined in claim 4, said core having indentations in said outer surface, said indentations being in alignment with the perforations in said plastic material.
 6. The yarn support as defined in claim 5, said indentations and said perforations having the same cross sectional area. 